Question 1

Select the strong acid from the following list.

Accepted Answer

A)  H3PO4(aq) 
B)  CH3CO2H(aq) 
C)  H2S(aq) 
D)  H2SO4(aq) 
E)  HF(aq)

Question 2

Select the solution below that is the most basic.

Accepted Answer

A)  [H3O+] = 1.0 x 10-4 M
B)  [H3O+] = 1.0 x 10-6 M
C)  [H3O+] = 1.0 x 10-7 M
D)  [H3O+] = 1.0 x 10-8 M
E)  [H3O+] = 1.0 x 10-10 M

Question 3

The Ka for formic acid is 1.8 ´ 10-4.Which of the following statements best describes the pH of a 0.0010 M solution of formic acid?

Accepted Answer

A)  The pH is greater than 0 but less than 3.
B)  The pH is exactly 3.
C)  The pH is greater than 3 but less than 7.
D)  The pH is exactly 7.
E)  The pH is greater than 7 but less than 11.

Question 4

If the pOH of a coffee sample is 8.85, what is the H3O+ concentration in the coffee?

Accepted Answer

A)  5.2 M
B)  7.1 x 10-8 M
C)  7.1 x 10-7 M
D)  7.1 x 10-6 M
E)  8.8 M

Question 5

Select the solution below that is the most acidic.

Accepted Answer

A)  [OH-] = 1.0 x 10-10 M
B)  [OH-] = 1.0 x 10-5 M
C)  [H3O+] = 1.0 x 10-6 M
D)  [H3O+] = 1.0 x 10-7 M
E)  [H3O+] = 1.0 x 10-9 M

Question 6

Select the two Brønsted-Lowry acids in the following equation: NH3(aq)  + HF(aq)  ⇌ NH4+(aq)  + F-(aq)

Accepted Answer

A)  NH3 and HF
B)  NH3 and F- 
C)  HF and F- 
D)  NH4+ and F- 
E)  HF and NH4+

Question 7

The indicator phenol red changes from yellow to red between pH 6.8 and pH 8.4.If phenol red is added to a solution, and the solution turns yellow, then

Accepted Answer

A)  the solution is basic, and the pH must be at or below 7.0.
B)  the pH of the solution must be below 6.8, and the solution is basic.
C)  the pH of the solution must be below 6.8, and the solution is acidic.
D)  the pH of the solution must be above 8.4, and the solution is basic.
E)  the pH of the solution is above 8.4, and the solution is acidic.

Question 8

Select the two Brønsted-Lowry bases in the following equation: CH3NH2(aq)  + H2O(l)  ⇌ CH3NH3+(aq)  + OH-(aq)

Accepted Answer

A)  CH3NH2 and H2O
B)  CH3NH2 and OH- 
C)  H2O and OH- 
D)  CH3NH2 and CH3NH3+ 
E)  CH3NH3+ and OH-

Question 9

Which of the following equations represents the behavior of HCO3- as a base?

Accepted Answer

A)  HCO3-(aq)  + H3O+(aq)  ⇌ H2CO3(aq)  + H2O(l) 
B)  HCO3-(aq)  + F-(aq)  ⇌ CO32-(aq)  + HF(aq) 
C)  HCO3-(aq)  + CN-(aq)  ⇌ CO32-(aq)  + HCN(aq) 
D)  HCO3-(aq)  + OH-(aq)  ⇌ CO32-(aq)  + H2O(l) 
E)  HCO3-(aq)  + H2O(l)  ⇌ H2CO3(aq)  + H3O+(aq)

Question 10

Polyprotic acids possess more than one ionizable hydrogen atom.

Accepted Answer

A) True 
 B)False

Question 11

What is the pH of a 0.020 M KOH solution?

Accepted Answer

A)  0.020
B)  1.70
C)  7.00
D)  12.30
E)  -1.70

Question 12

Which of the following is the strongest acid?

Accepted Answer

A)  HOCl, Ka = 4.0 x 10-8 
B)  HCN, Ka = 6.2 x 10-10 
C)  NH4+, Ka = 5.6 x 10-10 
D)  CH3CO2H, Ka = 1.8 x 10-5 
E)  HCO2H, Ka = 1.8 x 10-4

Question 13

The substance Mg(OH) 2(aq)  is:

Accepted Answer

A)  a strong acid.
B)  a weak acid.
C)  a strong base.
D)  a weak base.
E)  neither an acid nor a base.

Question 14

When ammonia, NH3, is dissolved in water, which ions are formed?

Accepted Answer

A)  NH3-(aq)  and OH-(aq) 
B)  NH3+(aq)  and OH-(aq) 
C)  NH4+(aq)  and OH-(aq) 
D)  NH4+(aq)  and H-(aq) 
E)  NH2-(aq)  and H+(aq)

Question 15

In pure water at 25 $\degree$C, the concentration of H3O+ is equal to the concentration of OH-.

Accepted Answer

A) True 
 B)False

Question 16

Which of the following ionizes to the greatest extent?

Accepted Answer

A)  HF, Ka = 6.3 x 10-4 
B)  HCN, Ka = 6.2 x 10-10 
C)  HOCl, Ka = 4.0 x 10-8 
D)  CH3CO2H, Ka = 1.8 x 10-5 
E)  HCO2H, Ka = 1.8 x 10-4

Question 17

Select the pair that consists of a base and its conjugate acid in that order.

Accepted Answer

A)  NH4+/NH3 
B)  HCO3-/CO32- 
C)  HCO3-/H2CO3 
D)  H3PO4/ HPO42- 
E)  CO32-/CO22-

Question 18

If the pH of a coffee sample is 5.15, what is the H3O+ concentration in the coffee?

Accepted Answer

A)  5.2 M
B)  7.1 x 10-8 M
C)  7.1 x 10-7 M
D)  7.1 x 10-6 M
E)  8.8 M

Question 19

The pH of an aqueous HCl solution can be greater than 7.

Accepted Answer

A) True 
 B)False

Question 20

A solution of a strong acid will have a greater H3O+ concentration than a solution of a weak acid under any circumstances.

Accepted Answer

A) True 
 B)False

Exam 13: Acids and Bases

In pure water at 25 °\degree° C, the concentration of H3O+ is equal to the concentration of OH-.

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The indicator phenol red changes from yellow to red between pH 6.8 and pH 8.4.If phenol red is added to a solution, and the solution turns yellow, then

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The Ka for formic acid is 1.8 ´ 10-4.Which of the following statements best describes the pH of a 0.0010 M solution of formic acid?

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Select the two Brønsted-Lowry acids in the following equation: NH3(aq) + HF(aq) ⇌ NH4+(aq) + F-(aq)

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Select the pair that consists of a base and its conjugate acid in that order.

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What is the pH of a 0.020 M KOH solution?

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The substance Mg(OH) 2(aq) is:

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Select the strong acid from the following list.

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A solution of a strong acid will have a greater H3O+ concentration than a solution of a weak acid under any circumstances.

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Which of the following is the strongest acid?

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If the pOH of a coffee sample is 8.85, what is the H3O+ concentration in the coffee?

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Select the two Brønsted-Lowry bases in the following equation: CH3NH2(aq) + H2O(l) ⇌ CH3NH3+(aq) + OH-(aq)

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If the pH of a coffee sample is 5.15, what is the H3O+ concentration in the coffee?

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Which of the following ionizes to the greatest extent?

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Select the solution below that is the most acidic.

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Select the solution below that is the most basic.

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When ammonia, NH3, is dissolved in water, which ions are formed?

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Polyprotic acids possess more than one ionizable hydrogen atom.

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Which of the following equations represents the behavior of HCO3- as a base?

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The pH of an aqueous HCl solution can be greater than 7.

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In pure water at 25 $\degree$ C, the concentration of H₃O⁺ is equal to the concentration of OH^-.

Correct Answer
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The K_a for formic acid is 1.8 ´ 10^-4.Which of the following statements best describes the pH of a 0.0010 M solution of formic acid?

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Select the two Brønsted-Lowry acids in the following equation: NH₃(aq) + HF(aq) ⇌ NH₄⁺(aq) + F^-(aq)

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The substance Mg(OH) ₂(aq) is:

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A solution of a strong acid will have a greater H₃O⁺ concentration than a solution of a weak acid under any circumstances.

Correct Answer
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If the pOH of a coffee sample is 8.85, what is the H₃O⁺ concentration in the coffee?

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Select the two Brønsted-Lowry bases in the following equation: CH₃NH₂(aq) + H₂O(l) ⇌ CH₃NH₃⁺(aq) + OH^-(aq)

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If the pH of a coffee sample is 5.15, what is the H₃O⁺ concentration in the coffee?

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When ammonia, NH₃, is dissolved in water, which ions are formed?

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Which of the following equations represents the behavior of HCO₃^- as a base?

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